Yep all the symptoms, but can't confirm No 3 as I never notice

But whatever happens it's blowing smoke and the only way to see what's worn and what has not worn is to take the head off, aslong as you have checked all the other things that could cause it like blocked breathers etc.
Head gasket set and bolts were about ?65, labour was ?150 as it's quite a time consuming job.
Hope you get yours sorted soon
Take care and let us know